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A particle-particle hybrid method for kinetic and continuum equations

机译:动力学方程和连续方程的颗粒-颗粒混合方法

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We present a coupling procedure for two different types of particle methods for the Boltzmann and the Navier-Stokes equations. A variant of the DSMC method is applied to simulate the Boltzmann equation, whereas a meshfree Lagrangian particle method, similar to the SPH method, is used for simulations of the Navier-Stokes equations. An automatic domain decomposition approach is used with the help of a continuum breakdown criterion. We apply adaptive spatial and time meshes. The classical Sod's 1D shock tube problem is solved for a large range of Knudsen numbers. Results from Boltzmann, Navier-Stokes and hybrid solvers are compared. The CPU time for the hybrid solver is 3-4 times faster than for the Boltzmann solver.
机译:我们为Boltzmann和Navier-Stokes方程提供了两种不同类型的粒子方法的耦合程序。 DSMC方法的一种变体用于模拟Boltzmann方程,而类似于SPH方法的无网格Lagrangian粒子方法用于Navier-Stokes方程的模拟。在连续分解准则的帮助下,使用了自动域分解方法。我们应用自适应空间网格和时间网格。对于大范围的克努森数,经典的Sod的一维激振管问题得以解决。比较了Boltzmann,Navier-Stokes和混合求解器的结果。混合求解器的CPU时间比Boltzmann求解器的CPU时间快3-4倍。

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